Steam generator



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Patented Nov. 19, 1929 UNITED STATES MARK ROBINSON, OF WATER-LOO, NEARLIVERPOOL, ENGLAND STEAM GENERATOR Application filed November 5, 1926.Serial No. 146,412.

This invention relates to improvements in steam-generators, and moreparticularly generators of the marine boiler type. The object of theinvention is to provide a steamgenerator of a compound character whichis adapted to suit varying steam supply requirements.

According to my invention, the lnternal space of a steam-generatorenclosed by the boiler-shell is divided into two separate portions, soas to form, in effect, two independent generator units, which arecapable of being worked independently of each other, or both together.To this end, the water and steam space enclosed by the boiler-shell ofthe main boiler is divided by longitudinal part1t1ons and an end orcross partition into two separate and independent generator units. One

of these generator units occupies the middle 2 portion of the spaceenclosed by the bo ler shell and the other generator unit comprises therest of the water and steam space, that is to say, the two wing portionson the sides of the central generator, and the spacebehind it. i

The plating forming the shell of the central generator unit extends fromtop to bottom of the main boiler shell and is riveted thereto, and thiscentral generator is stayed by stay-bolts to the wing-furnaces, and alsoin its lower part to the main boiler shell, and further its sides arestayed together by rows of cross stays. In its upper part it is furtherstayed by the longitudinally extending staybolts connecting the twoend-plates of the main boiler-shell.

The central generator is heated by the middle furnace and. one of the"clusters of smoke-tubes in the case of a three furnace 4o boiler, or bythe two middle furnaces in the case of a boiler with four furnaces.

The central generator is providedlwith means for supplying it withfeed-water to maintain an operative level therein for the independentgeneration of steam, and also with means for delivering the highpressure steam enerated in it.

It Wlll thus be seen that I provide a compound steam-generator dividedinto two in-v dependent generator units which are capable 5 of beingworked independently of each other, or in unison. Thus, forexample, ifonly a limited supply of steam is required, the central generator onlymay be used, the wing furnaces of the other'generator unit being dampeddown or out of action; while if a supply of steam is required thatnecessitates the use of the generators to their full capacity, thetwo'boiler units can be in action simultaneously. p

The invention will be further described with referenceto theaccompanying drawings, in which I Figure 1 is a front elevation (withone half in section) of a multitubular, three furna'ce marine-boiler,showing my invention applied thereto. 7

Figure 2 a longitudinal section of same. Figure 3 is a half sectionalfront elevation of invention applied to a marine-boiler with fourfurnaces.

Referring to these figures, it will be seen that the central portion ofthe space enclosed by the ordinary boiler-shell 1' is divided off by thetwo longitudinal partitions 2 and the cross partition 3 to form aseparate generator located centrally within the main boiler, which isthus divided into two-independent generators, namely a central one 4,and an outer one 5 comprising the rest of the water and steam spacewithin the main shell-1, and consisting mainly of two wing portionssituated on the sides of the central generator.

The partition plates 2, whichform the sides of the central generator,extend from top. to bottom of the shell 1 and are riveted thereto. Theyare stayed together by lines of crossstay-bolts 6 pitched at suitabledistances apart, Withnuts 7 and 8 screwed on the bolts on opposite sidesof the plates, and

with riveted washers 9 on the outer sides of the plates. In their lowerpart the partition plates 2 are suitably curved where they pass betweenthe respective furnace tubes 10, 11, and 12 and are stayed to the wingfurnace tubes 11 and 12 by staybolts 13 which screw into tapped holes inthe plates and have nuts screwed therein at both sides, and are providedwith riveted washers 14 at those places where the bolts pass through theplates in an angular direction. Still lower down, the plates 2 arestayed to theplower. Part of the boiler shell 1 by line ofexpansionis'tays, each stay consisting of eyebolts 15, the threadedshanks of which are passed respectively through tapped holes'in theshell 1 and the partition plates 2 and secured nuts and washers, theeyebolts being coupled together by a link 16. I t

The back end of the generator 4 is formed by the flanged gend-gplate 3,which is riveted to the side plates 2 of the "generator 4 and also attop and bottom to the boiler shell 1. It, is also riveted to the rearflanged ends 17, 18, of the furnace'tube 10, and to a frame 19. Thisframe 19 is angular in cross section and shaped to'conformto theconfiguration of r the front of the shell of the combustion cham ber 20,to which it isriveted. The end-plate 3 also forms aback tube-plate for anest of smoke tubes 21, which pass from the combustionchamber 20 throughthe-central generator 4 to a, front tube-plate 22 and smokeboX (notshown) on the boiler front. The front end of the central generator 4 isclosed by the boiler front end plate 23. a

24L are the longitudinal stay-bolts of the main boiler shell, six ofwhich areshown as passing'through the central generator unit 4 andthrough its end-plate '8, these bolts being nutted on each side of theend platefiand provided externally with riveted washers 25.

11 and 12 are the wingifurnacesfor heating the generator unit formed bytherest of the space within the mainshell 1, and 26 and 27 are nests ofsmoke-tubes traversing the water space on each side of the centralgenerator 4. 1 i

28 and 29 are manholedoors for giving access to the central generator14.

Any suitable means maybe provided for independently supplying the'twogenerator units iand 5; with:feed water, and each of these generators isalso fitted with other-nec essary fittings or mountingstoenable it to beindependently workable, such as stop-valves for drawing off (steam,safety-valves, water and steam-pressure gauges, and so forth. -30;

is a connection to a stop-valve for-supplying high pressure steam fromthe central generator 4, and 31 the connection to the safetyvalves ofsaid generator. 32 and -33 are the connectionsto the correspondingvalves of the other generator '5.

I declare that what I claim 1. A steam-generator having a plurality ofgenerator units capable of being independently worked, comprising acommon boiler shell formed as a horizontal cylindrical drum with closedends; two vertical longitudinally-extending partitions in said drum,said partitions being of less length than the length of said drum; atransverse partition connecting said vertical partitions and separatingthe central space within the partitions from the remaining space in thedrum, so that said remaining space forms a -U shaped unit, and thecentral space the central unit; stay-bolts connecting and spacing saidpartitions; and heating means and feed-water supply means in each cfsaid generator units.

2. steam generator as in claim 1, in which the 'c entral unit has afurnace tube which passes from the front wall of the drum to thetransverse partition and seals furnace openings therethrough'withnrespect to said'central :unit, and a furnace wall mountedon saidtransverse wall and forming a flue with the same in communication withsaid furnace tube, 'sai-d wall sealing said'fi-ue from said U- shapedunit. T

3. A steam generator as in claim .1, in whi ch furnace openings-areprovided the front wall of the drumyand tlue openings are provided atthe transverseipar tition, and furnace fines are located in the, units"and about said openings to 'sealth'e same,t-he vertical part-itionspassing; between furnace fines of the centraljandthexU-slhaped unit,thefflue for thegeneraftorunitextending to the said transversepartition'and sealing the said flue opening therein and "stay boltsconnecting said vertical-partitions with said furnace fines of the Ushaped unit.

4. In a isteam jgener-ator, a common boiler shell, two longitudinalpartitions reaching. from top to bottom -'of said boiler shell andsecured thereto, andextending-from the front plate of the common shelland terminating at a distance from the rear wall thereof,atransverseipartition having its'edges connected to the saidboil'ershell and forming back end plate connecting said longitudinal partitionsto form central and wing units, said central unit .laeing independently"workable, "walls forming in conjunction .with said transverse partitiona comloustio'nchamber adjacent the rear wall of the common shell, andfurnaces for said units connected between said transverse partition andsaid front plate, the front plate of said common shell being providedwith firing openings for said furnaces, said furnaces communicating withsaid "combustion chamber throughopenings in said transverse. partition.p

5. A steam generator as inclaim 4, in which the said longitudinalpartitions forming side walls of the central generator unit are stayedtogether by cross stays in-their upper part,

while in their lower part the said sidewalls are stayed to the wingfurnaces and also to the lower part of the main boiler shell.

6. A steam generator asin claim 4, in which said combustion chamber isextended upward from the furnace openings in the said transversepartition, and fire tubes are provided above and para11e1 to thefurnaces and extending between said front plate and said transversepartition.

In witness whereof, I have hereunto signed my name this 7th day ofOctober, 1926.

MARK ROBINSON.

